ID: 
1518
Maker's Name: 
Salter
Dimensions: 
1.5 × 1.4 × 9 cm

The portable scales are normally hung vertically, with a ring at one end. A ring at the other end allows a hook to be inserted for weighing eg an honest fisherman's catch. It will weigh to 3 kg. Inside is a spring that extends linearly with the applied force. This one came from a device for demonstrating centrifugal force.